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Old 05-09-2010, 10:45 AM   #1
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Can you run a heatpump with W8835 Envirazone with IAQ TH9421


My friend just got a new house that uses the W8835 Envirazone with IAQ TH9421 thermostats. I was reading through the manual and it says it supports a heat pump, but I can't seem to figure out how you'd do the cutoff temperature control. Would you have to use an outdoor temperature shutoff that doesn't have any control from the thermostat?

I have a heatpump with the vision pro8000 and I love being able to set the cutout temp and see the outdoor temp. I actually use the outdoor temp more then the heatpump does..

Since these IAQ stats only have 3 wires, how would you connect the outdoor thermostat to these?

What are the options in this case?

Thanks,

Jeff

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Old 05-09-2010, 11:34 AM   #2
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Can you run a heatpump with W8835 Envirazone with IAQ TH9421


It looks like maybe this is all that's needed?

1. Install outdoor sensor and run the wire in the garage to the outdoors (PN: C7089U1006) (~20 min + ~$20 material)
2. Install the outdoor sensor module right next to your zone control box (PN: 50022037-001) (~5 min + ~$20 material)


http://customer.honeywell.com/techli...69-2043EFS.pdf

-Jeff

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Old 05-09-2010, 03:45 PM   #3
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Can you run a heatpump with W8835 Envirazone with IAQ TH9421


The outdoor sensors wire to the Enviropanel.

Are you going to zone your system.
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Old 05-09-2010, 10:33 PM   #4
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Can you run a heatpump with W8835 Envirazone with IAQ TH9421


Quote:
Originally Posted by beenthere View Post
The outdoor sensors wire to the Enviropanel.

Are you going to zone your system.
This is a brand new house, they have an upstairs and downstairs zone with dampers. They have the back yard plumbed and wired for AC but no AC or HP installed. I want to figure out if their system would support a heat pump.

I think I need the module and the adapter. There is no temp sensor wiring on the zone control unit.
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Old 05-10-2010, 07:19 AM   #5
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Can you run a heatpump with W8835 Envirazone with IAQ TH9421


Sorry. You do need the module. Was thinking of a different panel.

It wires to the enviro panel.
The panel has 4 buses. Connect it to one of the buses not used for a thermostat. The module will identify itself to the panel.
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